No, then flame wars would be completely out of control. Someone would post something utterly incendiary, and once everyone had responded to the dick, he could just change his initial garbage to sound innocuous. Fark not having comment editing works just fine.

SirHolo:namegoeshere: What is the name of the slashie o letter, please? Does anyone know? Obviously I don't as I can't even type it properly. I was trying to spell a name to someone, but I couldn't do better than, "You know, the slashie o."

Mathematicians call it "null."

ø, it's like a zero, but much more serious about it.

According to the wiki linked helpfully above, the closest to a name it has in English is "o with slash."